What is the Modified Japanese Orthopedic Association Score (mJOA)?
The Modified Japanese Orthopedic Association Score (mJOA) is a clinical tool used primarily to assess the severity and prognosis of spinal cord injuries, particularly in cases of cervical myelopathy. This scoring system is an adaptation of the original JOA score, designed to provide a more detailed evaluation of neurological function, and has been widely used to determine both the initial impact of spinal cord damage and the outcomes after various treatments.
The mJOA score evaluates several aspects of neurological function, including motor skills in the front upper extremity and lower extremities, sensory function, and bladder control. Each category is scored based on the severity of impairment, with the total score indicating the overall level of function. A higher score represents better neurological function and less severe impairment.
The mJOA score provides a quantitative assessment of motor and sensory functions essential for treatment planning. The score ranges typically from 0 to 18, with various functions scored as follows:
- Motor function of upper extremities: This is graded from 0 (paralysis) to 4 (normal strength).
- Motor function of lower extremities: Also graded from 0 (paralysis) to 4 (normal strength).
- Sensory function: Includes the evaluation of touch and proprioceptive sensations, scored from 0 (loss of sensation) to 3 (normal sensation).
- Sphincter function: Assessed from 0 (poor control) to 3 (normal control).
The scoring allows physicians to quantitatively assess the impairment level of patients suffering and track changes over time. The mJOA score is particularly useful for assessing degenerative cervical myelopathy, and patients with cervical spondylotic myelopathy can also greatly benefit from assessments using this score.










